U.S. patent application number 12/453085 was filed with the patent office on 2010-07-15 for injection mold device.
Invention is credited to Yuing Chang, Li-Wei Chen, Chung-Shin Liu.
Application Number | 20100178376 12/453085 |
Document ID | / |
Family ID | 40835667 |
Filed Date | 2010-07-15 |
United States Patent
Application |
20100178376 |
Kind Code |
A1 |
Chang; Yuing ; et
al. |
July 15, 2010 |
Injection mold device
Abstract
An injection mold device includes: a stationary mold plate
including a stationary mold body, a protrusion, and a sprue having
a sprue open end; a movable mold plate formed with a first forming
part; and a stripper plate including a stripper mold body, a
recess, a second forming part, and a plurality of runners. When the
stationary mold plate, the movable mold plate, and the stripper
plate are assembled, the protrusion is received within the recess
such that the sprue open end is in fluid communication with the
runners, and the first forming part and the second forming part
form a mold cavity.
Inventors: |
Chang; Yuing; (Taipei,
TW) ; Liu; Chung-Shin; (Taipei, TW) ; Chen;
Li-Wei; (Taipei, TW) |
Correspondence
Address: |
ROSENBERG, KLEIN & LEE
3458 ELLICOTT CENTER DRIVE-SUITE 101
ELLICOTT CITY
MD
21043
US
|
Family ID: |
40835667 |
Appl. No.: |
12/453085 |
Filed: |
April 29, 2009 |
Current U.S.
Class: |
425/556 |
Current CPC
Class: |
B29K 2101/12 20130101;
B29C 45/2602 20130101; B29C 45/2756 20130101; B29C 33/0061
20130101 |
Class at
Publication: |
425/556 |
International
Class: |
B29C 45/27 20060101
B29C045/27 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 15, 2009 |
CN |
200910036778.7 |
Claims
1. An injection mold device comprising: a stationary mold plate
including a stationary mold body having a bottom surface, a
protrusion that protrudes from said bottom surface of said
stationary mold body, and a sprue formed in said stationary mold
body and having a sprue open end formed in said protrusion; a
movable mold plate formed with a first forming part; and a stripper
plate disposed between said stationary mold plate and said movable
mold plate, and including a stripper mold body having opposite
first and second sides, a recess formed in said first side, a
second forming part formed in said second side, and a plurality of
first runners extending from said recess to said second forming
part; wherein, when said stationary mold plate, said movable mold
plate, and said stripper plate are assembled, said protrusion is
received within said recess such that said sprue open end is in
fluid communication with said first runners, and said first forming
part and said second forming part form a mold cavity.
2. The injection mold device of claim 1, wherein said protrusion
has a bottom end disposed away from said bottom surface of said
stationary mold body, said sprue open end extending to said bottom
end of said protrusion, said recess having a recess bottom, said
first runners extending from said recess bottom to said second
forming part.
3. The injection mold device of claim 2, wherein said bottom end of
said protrusion is recessed to form a plurality of second runners
communicated with said sprue open end, said second runners being in
fluid communication with said first runners when said stationary
mold plate and said stripper plate are assembled.
4. The injection mold device of claim 3, wherein said stationary
mold body further has a top surface opposite to said bottom
surface, and includes an injection nozzle-receiving hole formed in
said top surface and in fluid communication with said sprue.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority of Chinese application no.
200910036778.7, filed on Jan. 15, 2009.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] This invention relates to an injection mold device, more
particularly to an injection mold device including a stationary
mold plate, a movable mold plate, and a stripper plate disposed
between the stationary and movable mold plates.
[0004] 2. Description of the Related Art
[0005] Referring to FIG. 1, a conventional three-plate injection
mold device 1 includes a stationary mold plate 11, a movable mold
plate 12, and a stripper plate 13 disposed between the stationary
mold plate 11 and the movable mold plate 12. The stationary mold
plate 11 has a bottom surface 114 and includes a sprue 111 and a
sprue open end 112 formed in the bottom surface 114. The stripper
plate 13 has opposite top and bottom ends 1311, 1312, a plurality
of first runners 131 formed in the top end 1311, and a first
forming part 132 formed in the bottom end 1312. The stripper plate
13 further has a plurality of second runners 133 that extend
downwardly from the first runners 131 and that are in fluid
communication with the first runners 131 and the first forming part
132. The movable mold plate 12 has an upper surface 122 and a
second forming part 121 formed in the upper surface 122.
[0006] When the stationary mold plate 11, the stripper plate 13,
and the movable mold plate 12 are assembled (not shown), the first
and second forming parts 132, 121 form a mold cavity. Melted
plastic material is injected into the sprue 111, and flows through
the first and second runners 131, 133, into the mold cavity. When
the melted plastic material is cooled, the plastic material in the
mold cavity is formed into a molded part, but those remaining in
the sprue 111, and the first and second runners 131, 133 become
plastic scrap or waste material.
[0007] Since each of the second runners 133 in the conventional
three-plate injection mold device 1 substantially extends from the
top end 1311 to the bottom end 1312 of the stripper plate 13, the
length of each of the second runners 133 is substantially identical
to a thickness of the stripper plate 13. Therefore, the length of
the plastic scrap or waste produced in each second runner 133 is
substantially as large as the thickness of the stripper plate 13 so
that the amount of the plastic scrap or waste produced in the
stripper plate 13 cannot be reduced, thereby increasing the
manufacturing cost of products.
SUMMARY OF THE INVENTION
[0008] Therefore, an object of the present invention is to provide
an injection mold device that can overcome the aforesaid drawback
associated with the prior art.
[0009] According to the present invention, an injection mold device
comprises: a stationary mold plate including a stationary mold body
having a bottom surface, a protrusion that protrudes from the
bottom surface of the stationary mold body, and a sprue formed in
the stationary mold body and having a sprue open end formed in the
protrusion; a movable mold plate formed with a first forming part;
and a stripper plate disposed between the stationary mold plate and
the movable mold plate, and including a stripper mold body having
opposite first and second sides, a recess formed in the first side,
a second forming part formed in the second side, and a plurality of
first runners extending from the recess to the second forming part.
When the stationary mold plate, the movable mold plate, and the
stripper plate are assembled, the protrusion is received within the
recess such that the sprue open end is in fluid communication with
the first runners, and the first forming part and the second
forming part form a mold cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Other features and advantages of the present invention will
become apparent in the following detailed description of the
preferred embodiment of this invention, with reference to the
accompanying drawings, in which:
[0011] FIG. 1 is an exploded sectional view of a conventional
injection mold device;
[0012] FIG. 2 is an exploded sectional view of the preferred
embodiment of an injection mold device according to this
invention;
[0013] FIG. 3 is the same view as FIG. 2 but with a stripper plate
assembled with a movable mold plate; and
[0014] FIG. 4 is the same view as FIG. 2 but with the stripper
plate assembled with movable and stationary mold plates.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0015] Referring to FIGS. 2 to 4, there is shown an injection mold
device 2 according to a preferred embodiment of this invention. The
injection mold device 2 includes a stationary mold plate 21, a
movable mold plate 22, and a stripper plate 23. In this embodiment,
the movable mold plate 22 is disposed below the stationary mold
plate 21.
[0016] The stationary mold plate 21 includes a stationary mold body
211, a protrusion 212, and a sprue 213. The stationary mold body
211 has a bottom surface 2111. The protrusion 212 protrudes from
the bottom surface 2111 of the stationary mold body 211 and has a
bottom end 212a disposed away from the bottom surface 2111. The
sprue 213 is formed in the stationary mold body 211, and has a
sprue open end 213a extending to the bottom end 212a of the
protrusion 212.
[0017] The movable mold plate 22 includes a movable mold body 221
and is formed with a first forming part 222. The movable mold body
221 has a top surface 2211 facing the bottom surface 2111 of the
stationary mold body 211, and the first forming part 222 is formed
in the top surface 2211.
[0018] The stripper plate 23 includes a stripper mold body 231, a
recess 232 formed in the stripper mold body 231, a plurality of
first runners 233, and a second forming part 234. The stripper mold
body 231 has a first side 231a facing the bottom surface 2111 of
the stationary mold body 211 and a second side 231b facing the top
surface 2211 of the movable mold body 221. In this embodiment, the
recess 232 is formed in and indented from the first side 231a, and
the second forming part 234 is formed in the second side 231b. The
first runners 233 extend from the recess 232 to the second forming
part 234. The recess 232 has a recess bottom 232a that is below the
first side 231a of the stripper mold body 231. The first runners
233 extend from the recess bottom 232a to the second forming parts
234.
[0019] In this embodiment, the bottom end 212a of the protrusion
212 is recessed to form a plurality of second runners 214. The
sprue open end 213a is in fluid communication with the second
runners 214. The second runners 214 are in fluid communication with
the first runners 233 when the stationary mold plate 21 and the
stripper plate 23 are assembled.
[0020] Referring to FIG. 4, when the stationary mold plate 21, the
movable mold plate 22, and the stripper plate 23 are assembled, the
stripper plate 23 is clamped between the stationary mold plate 21
and the moveable mold plate 22, and the protrusion 212 of the
stationary mold plate 21 is received within the recess 232 of the
stripper plate 23 such that the sprue open end 213a of the sprue
213 is in fluid communication with the first runners 233 through
the second runners 214, and the first forming part 222 and the
second forming part 234 form a plurality of mold cavities 200.
[0021] During injection molding, melted plastic material is fed
into the sprue 213, and travels downwardly into the mold cavities
200 via the sprue open end 213a, the second runners 214 and the
first runners 233. After the melted plastic material is cooled, the
plastic material in the mold cavities 200 is formed into molded
products, and those remaining in the sprue 213 and the first and
second runners 233, 214 become waste scraps that must be
removed.
[0022] In this embodiment, since the protrusion 212 is received in
the recess 232, a substantial length of the sprue 213 extends into
the stripper plate 23 so that the first runners 233 in the stripper
plate 23 can be shortened as compared to those of the conventional
injection mold device 1 (see FIG. 1). As a result, the amount of
the scraps produced in the first runners 233 of the stripper plate
23 is reduced.
[0023] It is worth mentioning that the stationary mold body 21
further includes an injection nozzle-receiving hole 215 formed in a
top surface 2112 opposite to the bottom surface 2111 of the
stationary mold body 211 and in fluid communication with the sprue
213. The nozzle-receiving hole 215 is adapted for receiving a
nozzle (not shown) of an injection molding machine therein. Since
the nozzle extends into the nozzle-receiving hole 215, the length
of the sprue 213, although extending into the protrusion 212, is
not increased compared to the sprue 111 of the conventional
injection mold device 1. Thus, extension of the sprue 213 into the
protrusion 212 does not increase the amount of plastic scrap
produced in the sprue 213.
[0024] During the opening of the injection mold device 2, the
movable mold plate 22 together with the stripper plate 23 is moved
downwardly from the stationary mold plate 21, and the stripper
plate 23 is subsequently moved upwardly from the movable mold plate
22. At this stage, the molded parts can be removed from the mold
cavities 200, and the plastic scrap can be removed from the sprue
213 and the first and second runners 233, 214.
[0025] In the injection mold device 2 according to the invention,
the protrusion 212 protrudes from the bottom surface 2111 of the
stationary mold plate 21, the nozzle-receiving hole 215 is formed
in the stationary mold plate 21 for extension of the nozzle
thereinto, and the sprue 213 extends through the protrusion 212.
When the stationary mold plate 21 and the stripper plate 23 are
assembled, the protrusion 212 is received in the recess 232 so that
the sprue 213 extends into the stripper plate 23. Therefore, the
length of the first runners 233 is reduced, and the amount of the
scrap formed in the first runners 233 is decreased compared to that
produced in the conventional injection mold device 1. The time
required for filling and cooling of the plastic material in the
injection mold device 2 can also be reduced.
[0026] With the invention thus explained, it is apparent that
various modifications and variations can be made without departing
from the spirit of the present invention. It is therefore intended
that the invention be limited only as recited in the appended
claims.
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